Clutch.



S. I. PRESCOTT.

I CLUTCH. APPLICATION FILED DEO.1B, 1913.

1,114,035, Patented Oct. 20, 1914.

2 SEEETSSHEET 1.

S. I. PRESCOTT.

CLUTCH.

APPLICATION FILED 1330.18; 1913.

1, 1 14,035, Patented 0015.20, 1914.

SHEETS-SHEET 2.

a citizen of the United States, Brooklyn, county of Kings,

UNITED STATES PATENT OFFICE.

SYDNEY I. PRESCOTT, OF BROOKLYN, NEW YORK,

ASSIGNOR TO MOTORFLEX EQUIY- MENT COMPANY, OF NEW YORK, N. Y., ACORPORATION OF NEW YORK.

CLUTCH.

To all whom it may concern:

Be it known that I, SYDNEY I. Pnnsoor'r, residing at and State of NewYork, have invented a new and useful Improvement in Clutches, of whichthe following is a specification.

This invention relates to an improvement in clutches, particularly thoseof the type used in the driving mechanism of motor cars or automobiles.

In Letters Patent of the United States, No. 1049531 and No. 1049532,granted to me January 7, 1913, there is disclosed a shock absorbingclutch; and for a full description of the objects, principle ofoperation and advantages of thistype of clutch, reference is made tosaid patents.

The present invention is an improvement over that disclosed in thepatents referred to, having for its main object the production of adevice whereby a still more flexible connection may be made between amotor driven member and the drive line.

With this and other objects not specifically mentioned in view, theinvention consists in certain combinations and constructions which willbe hereinafter fully de scribed and then specifically pointed out in theclaims hereunto appended.

In the accompanying drawings, which form a part of this specificationand in which like characters of reference indicate the same or likeparts, Figure 1 is a longitudinal section of a device constructed inaccordance with the invention, the view being taken on the line l1 inFig. 2'. Fig. 2 is a sectional view taken on the line 2-3 in Fig. 1,certain parts being broken away to more clearly illustrate the variousparts. Fig. 3 is a detailed end. view of a removable tail shaft used forlocking certain parts together and for piloting certain other parts. AndFig. 4 isa cross sectional view taken on the line l4 in Fig. 1.

In carrying the invention into effect, there is provided a motor drivenmember, a transmission shaft, means interposed between the motor drivenmember and the transmission- Specification of Letters Patent.

Application filed December 18, 1913.

Patented Oct. 20, 1914. Serial No. 807,404.

3 immovablemember, a clutch member interposed between the motor drivenmember and the longitudinally immovable member, and connections forcontrolling relative movement of said clutch member and said motordriven member in and out of driving engagement. All of these elementsmay be varied in construction within wide limits.

In the best constructions, when the device is to be used as a part ofthe drive line of an automobile, the motor driven member above referredto may be formed by the flywheelof the motor; and in the particulardevice selected to illustrate the invention, there is provided aflywheel or motor driven member 1, secured by means of bolts 2'to aflange 3, formed upon a crankshaft 4, which is the crankshaft of themotor, not shown.

There is further provided a transmission shaft 5 and means for clutchingsaid shaft to the flywheel or motor driven member 1. For purposes to behereinafter explained, the transmission shaft 5 is provided with aseries of integral splines 6 extending throughout the'greater part ofits length. The forward end (at the left in Fig. 1) of the transmissionshaft 5 is piloted upon a tail shaft 7. Although not essential in allconstructions, the tail shaft in the device illustrated is removablyconnected with the crankshaft 4 at the axis of the flywheel or motordriven member. This connection is effected by providing the forward endof the tail shaft 7 with a thread 8 screwing into a boss 9 formed uponthe rear end of the crankshaft 4. The tail shaft 7 is further providedwith a flange 10 provided with diametrically opposed recesses 11 (seeFig. 3). At the forward end of the transmission shaft 5, two of theintegral splines 6, which are diametrically opposed, project beyond theforward end of the transmission shaft and are adapted for engagementwith the recesses 11 for the purpose of screwing the tail shaft 7 in andout of position. The projecting ends referred to are each marked 1.2. Itwill be readily understood that by moving the transmission shaft forwarduntil the projecting ends or lugs 12 engage the re cesses 11 of the tailshaft flange 10, the tail shaft may be readily locked in or removed fromthe position shown in Fig. 1. At the rear end of the transmission shaft5 is an integral head 13 substantially hexagonal in cross section andadapted for connection with the drive line to the rear thereof. Incertain constructions, as for instance when the device is used inconnection with what is known as a unit type motor and gear set, thetransmission shaft 5 will be otherwise formed at its rear end. At apoint adjacent this rear end, the transmission shaft is supported by aball bearing 14 of well known construction. This ball bearing iscarriedby an inclosing housing 15 formed of pressed steel and secured tothe flywheel or motor driven member 1 by means of a series of eightbolts 16. It is of course obvious that the number of bolts, when boltsare used, may be varied; and it is also obvious that other means forsecuring the inclosing housing and the flywheel 1 may be utilized ifdesired. From the foregoing it will be readily understood that thishousing is carried by and forms a part of the flywheel 1; and that thebearing 14 and the tail shaft 7, upon which the forward end of thetransmission shaft 5 is piloted, keep said transmission shaft alwaysaccurately in alinement with the axis of the crankshaft 4 and fly wheelor motor driven member 1. It will be readily understood further that theinelosing housing 15 performs two distinct functions; that is, it servesto retain lubricant and exclude dust, and it also operates as a part ofthe flywheel or motor driven member 1.

Means are interposed between the flywheel or motor driven member 1 andthe transmission shaft 5 for absorbing shock due to variations in speedof the motor driven member and the transmission shaft, said meansincluding operating connections and a longitudinally immovable member.This longitudinally immovable member in the device selected toillustrate the invention consists of a sleeve 17 having, in a transverseplane adjacent its forward end, a flange 18 provided with six bosses 19symmetrically arranged "around its periphery, and each of these bossescarries a bolt 20. The bolts pass through spacing sleeves 21 and alsothrough a flange formed on a pressed steel casing 22 extendingrearwardly to a point adjacent the bearing 14 where the casing is turnedinwardly close to the transmission shaft 5, the inwardly turned endbeing marked 23. The sleeve 17 is provided with a multiple internal V-thread 24, this particular type of thread not being essential but beingdesirable because it provides a greater frictional surface for a givenover-all length than can be secured with a square thread like that shownin my earlier Patents, No. 1049531 and .No. 1049532. The fact that agreater surface can be obtained for a given over-all length by the useof this particular form of thread also enables me to shorten the deviceas a Whole without sacrificing frictional driving surface of the thread.The internal thread 24 is in engagement with a corresponding externalthread 25 formed upon a transmission member or nut 26, which isrotatable with and longitudinally movable with respect to thetransmission shaft. While in certain constructions, the connectionbetween this nut and the transmission shaft might be different; asshown, the nut 26 is provided with recesses 27 in which the splines 6 ofthe transmission shaft 5 are slidably mounted. By an inspection of Fig.1, it will be noted thatthat portion of the nut 26 which is providedwith the recesses 27 is considerably shorter than the nut itself, beingshort enough to be readily machined and being long enough to insure widebearing surface, and consequently long life. The nut 26 is provided atits rear end with a flange 28, and against this flange rests a hardenedsteel ring or washer 29. Bearing against this washer 29 and also againstthe flange 18 before referred to, is a heavy compression spring 30coiled around the sleeve 17 before referred to. Interposed between theflange 28 and the end 23 of the casing 22 is a cushioning washer 31 heldin place by a series of split fasteners 32. The particular function ofthis cushioning device is to soften the blow and deaden the noise whenthe nut reaches the extreme of its rearward movement.

A clutch member is interposed between the motor driven member orflywheel 1 and the longitudinally immovable member or sleeve 17 andconnections are provided for controlling the relative movement of saidclutch member and said motor driven member in and out of drivingengagement and this clutch member and these connections may be varied inconstruction within wide limits. Although not essential in allconstructions, the motor driven member 1 is made up of two flywheelsections, one section embracing the flywheel proper which is providedwith a frictional driving surface 33. The other section of the flywheelis longitudinally movable and consists of an annular plate section 34provided with a frictional driving surface 35, the two frictionaldriving surfaces referred to being oppositely disposed as is clearlyshown in Fi g. l. The plate section 34 is ribbed, as shown in Fig. 2, tostiffen the same and to prevent its buckling when under pressure, and ata point adjacent its periphery is provided with a series of bosses 36through which the bolts 16 pass. It will be readily understood that bymeans of this construction, the plate section 34 always rotates with themain section of the flywheel 1, but is longitudinally movable withrespect thereto. Coiled around each of the bosses 36 is a spring 37, thefunction of which is to normally press the plate section 34 toward themain section of the flywheel 1.

For the purpose of transmitting motion from the flywheel to the sleeve17, there is provided a clutch member 38 longitudinally movable upon thespacing sleeves 21 before referred to. This clutch member has twofrictional driving surfaces located between the frictional drivingsurfaces 33 and 35 of the flywheel sections before referred to, and thatportion of the clutch member 38 lying between said frictional drivingsurfaces is studded with inserted corks 39. The cork inserts aredesirable on account of their high coefficient of friction, but are notabso utely necessary and may, in certain constructions, be dispensedwith. It will be readily understood that when the parts are in theposition shown in Fig. 1, the clutch member 38 is clamped between themain flywheel section and the plate section 34, so that the sleeve 17and the casing 22 will be rotated as the flywheel rotates.

Means are provided for separating the flywheel sections and therebyreleasin the clutch member 38; and in the device se ected to illustratethe invention, this means consists of a series of four levers 40. Theselevers are fulcrumed at 41 to yokes 42, which in turn are bolted to theinclosing housing 15, as clearly shown in Fig. 1. The outer arm of eachlever is provided with a slot engaging a stud 43 secured to bosses 44formed on the plate section 34 before referred to. The inner end of eachlever 40 is provided with a slotted head 45. While other means forsimultaneously operating these levers may be employed in certainconstructions, there is shown a plurality of plungers 46 the forward endof each of which abuts against the slotted head 45 of one of the levers40 just described. Each of the plungers 46 slides in a tube 47. One endof each tube is expanded in a suitable aperture in the inclosing housing15, and the other end is expanded in a suitable aperture in a stiffeningweb 48 which is riveted to the inclosing housing. When a series ofplungers is used for operating the levers, some means will be employedfor simultaneously operating the plungers. In the device illustrated,this means consists of a 1 flanged ring 49 surrounding the rear end ofthe housing 15 and abutting against the rear ends of the plungers. Theflanged ring 49 may be operated by connections of a well known.character including a pedal. The clutch member 38 will operate when dryor when running in a bath of lubricant; and

when it is desired to run it in a bath of lubricant, the device may beprovided with a screw plug threaded in the housing 15 at a pointadjacent its outermost periphery. It is obvious that the filling plugmay also be used for drainage purposes. Such plugs are common and wellknown in the art and one is indicated at 50 in Fig. 2.

The sleeve 17 is provided at its forward end with a cylindricalextension 51. Within this extension is located a combined radial andthrustbearing 52 of well known construction. The outer member ofthisbearing is held fast to the cylindrical extension by means of a lock nut53 threaded upon the cylindrical extension 51. The inner member of thethrust bearing 52 rests upon the boss 9, and when the parts areassembled, is locked thereupon by means of the flange 10 of the tailshaft 7 before referred to. It will be readily understood that thethrust bearing 52 prevents longitudinal movement of the sleeve 17 andthat the clutch member 38 floats fore and aft or is longitudinallymovable with respect to the sleeves 21 carried by the flange 18 of thesleeve 17 and it will be readily understood that when the clutch isdisengaged, the clutch member 38 floats to a neutral position betweenthe separated flywheel sections. When it is desired to clutch therotating motor driven member to the transmission shaft, pressure uponthe flanged ring 49 through the well known mechanism referred to, butnot shown, is removed. The springs 37 then come into action to force theplate section 34 toward the longitudinally immovable section of theflywheel 1. As the plate section 34 moves forward, it comes into contactwith the rear side of the clutch member 38 and the generation offriction between the two begins. The plate section 34 continues to moveforward carrying with it the clutch member 38 until the latter is firmlyclamped between said plate section and the main section of theflywheel 1. When this occurs, the sleeve 17 will be rotated at the samespeed as the flywheel. As the load upon the transmission shaft 5 resistsany sudden turning of said shaft, the rotating sleeve 17 by means of itsthreaded engagement with the nut 26, operates to pull the latter withinitself and thereby compress the absorption spring 30. As the spring iscompressed, the pressure upon the friction of the contacting frictionalsurfaces of the threads of the sleeve 17 and nut 26 increases in agreater ratio than the increase in the area of said surfaces as the nutgoes into the sleeve. The effective result is a progressively increasingturning effort upon the transmission shaft 5 whereby sudden shoclrtosaid transmission shaft and the drive line to which it is connected iscompletely eliminated. It will be readily understood that since shock iseliminated, more power may be developed in the motor by a higher speedof rotation when the clutching action takes place than is possible inthe absence of a shock absorbing device; and that a quicker get-away canbe made through the agency 0 the greater power initially exerted than ispossible in the absence of a shock absorbing device. The action of thedevice after clutching takes place is precisely the same as the actionof the devices disclosed in my Patents N 0. 1049531 and No. 1049532. Itis therefore deemed unnecessary to repeat a description of this actionherein.

Changes and variations may be made in the device by means of which theinvention is carried 1nto efiect. The invention is therefore not to berestricted to the precise details of the structure shown and described.

What is claimed is:

1. The combination with 'a' motor driven member, of a transmissionshaft, means interposed between the motor driven member and thetransmission shaft for absorbing shock due to variations in speed of themotor driven member and the transmission shaft said means includingoperating connections and a longitudinally immovable member and beingarranged to transmit power without yielding under a load below normalbut arranged to yield to a limited extent under load above normal, aclutch member interposed between the motor driven member and thelongitudinally immovable member, and connections for controllingrelative movement of said clutch member and said motor driven member inand out of driving engagement.

2. The combination with a longitudinally immovable motor driven member,ofa transmission shaft, means interposed between the motor driven memberand the transmission shaft for absorbing shock due to variations inspeed of the motor driven member and the transmission shaft said meansincluding operating connections and a longitudinally immovable memberand being arranged to transmit power without yielding under a load'belownormal but arranged to yield to a limited extent under load abovenormal, a longitudinally movable clutch member interposed between themotor driven member and the longitudinally immovable member, andconnections for controlling movement of said clutch member in and out ofdriving engagement with the motor driven member.

3. The combination with a motor driven member, of a transmission shaft,means interposed between the. motor driven member and the transmissionshaft for absorbing shockdue to variations in speed of the motor drivenmember and the transmission shaft said means including operatingconnections and a longitudinally immovable member and being arranged totransmit power without yielding under a load below normal but arrangedto yield to a limited extent under load above normal, a clutch membersupported by and rotatable with the longitudinally immovable member, andconnections for controlling relative movement of said clutch member andsaid motor driven member in and out of driving engagement.

l. The combination with a motor driven member having a frictionaldriving surface of a transmission shaft, means interposed between themotor driven member and the transmission shaft for absorbing shock dueto variations in speed of the motor driven member and the transmissionshaft said means including operating connections and a longitudinallyimmovable member and being arranged to transmit power without yieldingunder a load below normal but arran ed to yield to a limited extentunder loaf above normal, a longitudinally floating member supported byand rotatable with the longitudinally immovable member and having africtional driving surface adapted for engagement with the rictionaldriving surface of the motor driven member, and connections forcontrolling movement of said floating member in and out of engagementwith the motor driven member.

5. The combination with a motor flywheel having a frictional drivingsurface, of a transmission shaft, means interposed between the motorflywheel and the transmission shaft for absorbing shock due tovariations in speed of the motor flywheel and the transmission shaftsaid means including operating connections and a longitudinallyimmovable member and being arranged to transmit power without yieldingunder a load below normal but arranged to yield to a limited extentunder load above normal,

a longitudinally floating member supported by and rotatable with thelongitudinally immovable member and having a frictional driving surfaceadapted for engagement with the frictional driving surface of the motorflywheel, and connections for controlling movement of said floatingmember in and out of engagement with the motor flywheel.

6. The combination with a motor flywheel having a longitudinallyimmovable section and having a longitudinally movable section thesections being provided with oppositely disposed frictional drivingsurfaces, of a transmission shaft, means interposed be tween the motorflywheel and the transmission shaft for absorbing shock due to vari-='ations in speed of the motor flywheel and the transmission shaft saidmeans including operating connections and a longitudinally immovablemember and being arranged to transmit power without yielding under aload below normal but arranged to yield to a limited extent under loadabove normal, a longitudinally floating member supported by androtatable with the longitudinally immovable member and having frictionaldriv- .the sections being provided with oppositely and having alongitudinally movable see I ing surfaces located between and adaptedfor engagement with the frictional driving surfaces of the motorflywheel, and connec? tions for controlling movement of said floatingmember in and out of engagement with the motor flywheel.

7. The combination with a motor flywheel having a longitudinallyimmovable section and having a longitudinally movable section disposedfrictional driving surfaces, of a transmission shaft, means interposedbetween the motor flywheel and the transmission shaft for absorbingshock due to variations in speed of the motor flywheel and thetransmission shaft said means including operating connections and alongitudinally immovable member and being arranged to transmit powerwithout yielding under a load below normal but arranged to yield to alimited extent under load above normal, a longitudinally floating membersupported by and rotatable with the longitudinally immovable member andhaving frictional driving surfaces located between and adapted forengagement with the frictional driving surfaces of the motor flywheel,connections for controlling movement of said floating member in and outof engagement with the motor flywheel, and an inclosing housing carriedby and formin a part of said motor flywheel for retaining ubricant andexcluding dust.

8. The combination witha motor flywheel having a longitudinallyimmovable section and having a longitudinally movable section thesections being provided with oppositely disposed frictional drivingsurfaces, of a transmission shaft, means interposed between the motorflywheel and the transmission shaft for' absorbing shock due tovariations in speed of the motor flywheel and the transmission shaftsaid means including operating connections and a longitudinallyimmovable member and being arranged to transmit powerwithout yieldingunder a load below normal but arranged to yield to a limitedextent underload above normal, a longitudinally floating. member supportedby androtatable with the longitudinally immovable member and having frictionaldriving surfaces located between and adapted for engagement with thefrictional driving surfaces of the motorflfly-' wheel, connections forcontrolling movement of said floating member in and out of engagementwith the motor flywheel, and an inclosing housing carried by and forminga part of said motor flywheel for retaining lubricant and excludingdust, and a bearing caried by said housing for supporting thetransmission shaft.

9. The combination with a motor flywheel having a longitudinallyimmovable section tion the sections being provided with oppositelydisposed frictional driving surfaces, of a transmission shaft, meansinterposed between the motor flywheel and the transmission shaft forabsorbing shock due to cated between and adapted for engagement i withthe frictional driving surfaces of the motor flywheel, a plurality ofsprings pressing against the longitudinally movable section of the motorflywheel to normally cause I the frictional driving surfaces of thelongitudinally floating member to be engaged by the frictional drivingsurfaces of the motor flywheel sections, a plurality of levers engagingthe longitudinally movable section of the motor flywheel, and means forsimultaneously operating said levers to produce a movement of thelongitudinally movable section of the motor flywheel whereby thelongitudinally floating member is released.

10. The combination with a motor flywheel having a longitudinallyimmovable section and having a longitudinally movable section thesections being provided with oppositely disposed frictional driving surfaces, of a transmisson shaft, means interposed between the motorflywheel' and the transmission shaft for absorbing shock due tovariations in speed of the motor flywheel and the transmission shaftsaid means 1ncludin operating connections and a longitudina ly'immovable member, a longitudinally floating member supported by androtatable with the longitudinally immovable member andlhaving frictionaldriving surfaces located between and adapted for engagement with thefrictional driving surfaces of the motor flywheel, a plurality ofvsprings pressing against the longitudinally .movable section of themotor flywheel to .no'rmally cause the frictional driving surfaces ofthe longitudinally floating member to be engaged by the frictionaldriving surfaces of the motor flywheel sections, a plu rality of leversengaging the longitudinally movable section of the motor flywheel, aplurality of plungers engaging the levers,

and means for simultaneously operating said plungers to produce amovement of the f longitudinally movable sectionof the motor flywheelwhereby thelongitudinally floating: member is released. I

11. The combination with a motor flywheel having a longitudinallyimmovable section and having a 10m itudinally movable section thesections being provided with oppositely disposed frictional drivingsurfaces,'of a transmission shaft, means lIllJBI said floating member inand out of engageposed between the motor flywheel and the transmissionshaft for absorbing shock due to "ariations in speed of the motorflywheel and the transmission shaft said means including operatingconnections and a longitudinally immovable member, a longitudinallyfloating member supported by and rotatable with the longitudinallyimmovable member and havingfrictional driving surfaces located betweenand adapted for engagement with the frictional drivin surfaces of themotor flywheel, an inclosing housing carried by and formin a part ofsaid motor flywheel for retaining lubricant and excluding dust, aplurality of tubes longitudinally mounted in the housing, and operatingconnections for controlling movement of ment with the motor flywheelsaid connections including a plurality of plungers slidably mounted inthe housing tubes.

- 12. The combination with a motor driven member, of a transmissionshaft, an inter nally threaded sleeve longitudinally immovable withrespect to the motor driven member, an externally threaded nut rotatablewith and longitudinally movable with respect to the transmission shaftand in threaded engagement with said sleeve, :1 pressure devicecontrolling the friction of said sleeve and nut, and means for clutchingsaid sleeve to the motor driven member.

13. The combination with a motor driven member, of a transmission shaft,an internally threaded sleeve longitudinally immovable with respect tothe motor driven member, an externally threaded nut splined andlongitudinally-movable on the transmission shaft and in threadedengagement with said sleeve, a pressure device controlling the frictionof said sleeve and nut, and means for clutching said sleeve to the motordriven member.

14. The combination with a motor driven member, of a transmission shaft,an internally V-threaded sleeve longitudinally immovable with respect tothe motor driven member, an externally V-threaded nut splined andlongitudinallymovable on the transmission shaft and in threadedengagement with said sleeve, a pressure device controlling the frictionof said sleeve and nut, and means for clutching said sleeve to the motordriven member.

15. The combination with a motor driven member, of a transmission shaft,an internally threaded sleeve longitudinally immovable with respect tothe motor driven member, an externally threaded nut splined andlongitudinally movable on the transmission shaft and threaded engagementwith said sleeve, a compression spring controlling. the friction of saidsleeve and nut, and means for clutchingsaid sleeve to the motor drivenmember.

sleeve, a pressure device controlling the friction of said sleeve andnut, means for clutching said sleeve to the motor driven member, and aninclosing housing carried by and forming a part of the motor drivenmember for retaining lubricant and excluding dust.

17. The combination with a motor driven member, of a transmission shaft,an internally threaded sleeve longitudinally immovable with respect tothe motor driven member, an externally threaded nut splined andlongitudinally movable on the transmission shaft and in threadedengagement with said sleeve, a pressure device controlling the frietionof said sleeve and nut, means for clutching said sleeve to the motordriven member, and a cushioning device adapted for engagement with saidnut at one end of its path of movement.

18. The combination with a motor driven member, of a tail shaft mountedat the axis of said member, a transmission shaft piloted onsaid tailshaft, an internally threaded sleeve longitudinally immovable withrespect to the motor driven member, an externally threaded nut splinedand longitudinally movable on the transmission shaft and in threadedengagement with said sleeve, a pressure device controlling the frictionof said sleeve and nut, and means for clutching said sleeve to the motordriven member.

19. The combination with a motor driven member, of a removable tailshaft mounted 105 at the axis of said member, a transmission shaftpiloted on said removable tail shaft,

an internally threaded sleeve longitudinally immovable with respect tothe motor driven member, an externally threaded nut splined andlongitudinally movable'on the transmission shaft and in threadedengagement with said sleeve, a ressure device controlling the frictionof sald sleeve and nut, and means for clutching said sleeve to the motordriven member.

20. The combination with a motor driven member, of a transmissionshaft,an internally threaded sleeve longitudinally immovable withrespect to the motor driven member, an externally threaded nut splinedand longitudinally movable on the transmission shaft and in threadedengagement with said sleeve, a pressure device controllin the frictionof said sleeve and nut, means or clutching said sleeve to the motordriven member, an inclosing housing for retaining lubricant andexcluding dust, and a bearing carried by the housing for supporting saidtransmission shaft. 1:0

21. The combination with a motor driven member, of a tail shaft mountedon the axis of said member, a transmission shaft piloted on said tailshaft, an internally threaded sleeve longitudinally immovable withrespect to the motor driven member, an externally threaded nut splinedand longitudinally movable on the transmission shaft and in threadedengagement with said sleeve, a pressure device controlling the frictionof said sleeve and nut, means for clutching said sleeve to the motordriven member, an inclosing housing carried by and forming a part of themotor driven member for retaining'lubricant and excluding dust, and abearing carried by the housing for supporting the transmission shaft inalinement with the axis of the motor driven member and tail shaft.

22. The combination with a motor driven member, of a transmission shaft,an internally threadeo sleeve, longitudinally immovable with respect tothe motor driven member, a removable tail shaft located at the axis ofthe motor driven member, a thrust bearing carried by the internallythreaded sleeve and interposed between said tail shaft and said sleeveand locked in position by said tail shaft, an externally threaded nutsplined and longitudinally movable on the transmission shaft and inthreaded engagement with said sleeve, a pressure device controlling thefriction of said sleeve and nut, means for clutching said sleeve to themotor driven member, an inclosing housing carried by and forming a partof the motor driven member for retaining lubricant and excluding dust,and a bearing carried by the housing for supporting the .transmissionshaft said transmission shaft being also piloted on said tail shaft.

23. The combination with a motor driven member, of a transmission shaft,an internally threaded sleeve longitudinally immovable with respect tothe motor driven memher, a removable tail shaft located at the axis ofthe motor driven member, a thrust bearing carried by the internallythreaded sleeve and interposed between said tail shaft and member, andan inclosing housing carried by and forming a part 0 the motor drivenmember for retaining lubricant and excluding dust, and a bearing carriedby the housing for supporting the transmission shaft said transmissionshaft being also piloted on said tail shaft and provided with means forremoving said tail shaft.

24. The combination with a motor driven member, of a transmission shaft,an internally threaded sleeve longitudinally immovable with respect tothe motor driven memher, a removable tail shaft located at the axis ofthemotor driven member and provided with a locking flange having twodiametrically opposed recesses, a thrust bearing carried by theinternally threaded sleeve and interposed between said tail shaft andsaid sleeve and locked in position by the flange of said tail shaft, anexternally threaded nut splined and longitudinally movable onthetransmission shaft and in threaded engagement with said sleeve, apressure device c0ntrolling the friction of said sleeve and nut, meansfor clutching said sleeve to the motor driven member, and an inclosinghousing carried by and forming a part of the motor driven member forretaining lubricant and excluding dust, and a bearing carried by thehousing for supporting the transmission shaft said transmission shaftbeing piloted on said tail shaft and provided with a pair ofdiametrically opposed lugs adapted for engagement with the recesses ofthe tail shaft flange for removing said tail shaft.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

SYDNEY ll. PRESCOTT.

Witnesses:

ELIZABETH Lomsn RUssELL, D. H. HAYNEs.

